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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>7-底部半透明</title>
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    <!-- 2.导入本页面样式 -->
    <link rel="stylesheet" href="css/opacity.css">
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    <div class="box">
        <img src="images/bg.jpg" alt="">
        <div class="words"></div>
    </div>
</body>
</html>